How to configure log4j in mapreduce program.

[#1]

I have created a mapreduce program and used slf4j and log4j for logging in my MR JAVA program, but logs which i defined are not appearing in YARN application logs, where as logs are appearing in the CLI where i am running the job. Can you please tell if need to defined log4j.properties to override or define anywhere else?

[#2]

Hi Varma,

Please go through below links. Hope it will be useful.

http://stackoverflow.com/questions/28119423/standard-practices-for-logging-in-mapreduce-jobs

http://grepalex.com/2012/11/12/hadoop-logging/

Thanks,

Mahesh

[#3 · Accepted solution]

@Varma vetukuri

This post should help you https://community.hortonworks.com/questions/44564/map-reduce-logging-using-log4j-and-yarn-log-aggreg...